Emergency falling control system of large-height overhead working truck

Abstract

The emergency falling control system comprises a manual pump, a pressure gauge and a two-position two-way manual reversing valve which are arranged on the side face of a rotary table, and the manual pump is connected with a second oil pipe, a third oil pipe, a fourth oil pipe and a fifth oil pipe and further connected with a second balance valve connected with a two-arm telescopic cylinder. The third balance valve is connected with the two-arm variable-amplitude cylinder, the fourth balance valve is connected with the one-arm telescopic cylinder, a rotary brake is arranged in the rotary table, the rotary brake is connected with a shuttle valve through a sixth oil pipe, the rotary brake is connected with a rotary motor, and a rotary cushion valve is arranged between the rotary motor and the shuttle valve. According to the emergency falling control system of the large-height overhead working truck, the manual pump is connected into the control oil way, and due to the fact that the control oil way only transmits pressure and does not transmit flow, labor is saved during operation.

Description

Technical Field

[0001] The invention relates to the technical field of a high-altitude aerial work platform or an aerial work vehicle, and more specifically, to an emergency drop control system of a high-altitude aerial work vehicle. Background Art

[0002] In order to reduce the height and length of the whole vehicle, high-altitude aerial work vehicles or platforms are usually designed with multi-section folding and telescopic arms. The structure is relatively complex, the control logic is also complex, and there are many large oil cylinders. Once there is a problem with the electronic control system or the main oil pump fails, people will panic if they cannot come down from the high altitude. Therefore, how to quickly and effectively lower people to a safe place is crucial. According to the standards for aerial work vehicles, the control system must be set up with emergency operations. To ensure safety, it is necessary to consider how to put people in a safe position when there is no electricity or power source.

[0003] The emergency treatment plan currently adopted is: the main power source and the emergency power source are connected in parallel, and the electronically controlled hydraulic valves are equipped with emergency operating handles. When there is a problem with the electronic control system and the main power source is normal, the hydraulic emergency operating handle is generally used to control the hydraulic valve to lower the arm; when there is a problem with the main power source and the electronic control system is normal, the emergency power source is generally started, and the electronic control operation is normal to lower the arm. In this case, if the power of the emergency power source is large enough, such as a motor pump, a gasoline engine pump, etc., there is no problem in lowering the arm. If the power source is low, such as a DC motor pump, due to the need for a large flow rate and a large energy consumption, the general battery cannot meet the requirements; if a manual pump is used, it will be very inefficient and difficult to achieve through manual operation.

[0004] Therefore, there is an urgent need for an emergency drop control system for a high-altitude aerial work vehicle. Summary of the invention

[0005] The purpose of the present invention is to provide an emergency descent control system for a high-altitude aerial work vehicle to solve the problems in the above-mentioned prior art. A manual pump is connected to the control oil circuit. Since the control oil circuit only transmits pressure but not flow, it is easier to operate.

[0006] The present invention provides an emergency falling control system for a high-altitude aerial work vehicle, which includes: a manual pump, a pressure gauge and a two-position two-way manual reversing valve arranged on the side of a turntable, the manual pump is connected with a second oil pipe, a third oil pipe, a fourth oil pipe and a fifth oil pipe, a second balancing valve connected with a two-arm telescopic cylinder, a third balancing valve connected with a two-arm variable amplitude cylinder, and a fourth balancing valve connected with a one-arm telescopic cylinder. A slewing buffer valve and a shuttle valve connected in parallel with a slewing brake are arranged in the turntable, and a slewing motor is arranged between the slewing brake and the slewing buffer valve, wherein:

[0007] The second balancing valve, the third balancing valve and the fourth balancing valve are all equipped with shuttle valves S, and each shuttle valve S is respectively connected to the oil outlet of the manual pump;

[0008] A shuttle valve S is arranged in the rotary buffer valve, and the shuttle valve S is respectively connected to the rotary buffer valve, the second oil pipe and the rotary motor; a stop valve Z is arranged in the rotary buffer valve;

[0009] The oil suction port X of the manual pump is connected to the oil tank or the integrated oil return oil circuit; the oil outlet P of the manual pump is respectively connected to the oil circuits of the second oil pipe, the third oil pipe, the fourth oil pipe and the fifth oil pipe, the pressure gauge, and the 2 ports of the two-position two-way manual reversing valve;

[0010] A throttling stop valve is provided on each of the oil lines of the second oil pipe, the third oil pipe, the fourth oil pipe and the fifth oil pipe;

[0011] Port 1 of the two-position two-way manual reversing valve is connected to an oil tank or an integrated oil return oil circuit.

[0012] As described above, in the emergency descent control system for a high-altitude aerial work vehicle, preferably, the port 1 of each of the shuttle valves S corresponding to the second balancing valve, the third balancing valve and the fourth balancing valve is respectively communicated with the port V1 of the second balancing valve, the third balancing valve and the fourth balancing valve, the port 3 of each of the shuttle valves S is respectively communicated with the control port K2 of the second balancing valve, the third balancing valve and the fourth balancing valve, and the port 2 of each of the shuttle valves S is respectively communicated with the oil outlet of the manual pump;

[0013] The shuttle valve S corresponding to the rotary buffer valve is arranged between the V1 port and the V2 port of the rotary buffer valve, the 1 port of the shuttle valve S is communicated with the V2 port of the rotary buffer valve, the 2 port of the shuttle valve S is communicated with the V1 port of the rotary buffer valve, the 3 port of the shuttle valve S is connected with the 1 port of the shuttle valve, the 2 port of the shuttle valve is connected with the second oil pipe, and the 3 port of the shuttle valve is connected with the brake port K of the rotary motor; the stop valve Z of the rotary buffer valve is arranged between the C1 port and the C2 port of the rotary buffer valve;

[0014] A throttling stop valve Z4 is provided on the oil circuit of the second oil pipe, a throttling stop valve Z3 is provided on the oil circuit of the third oil pipe, a throttling stop valve Z1 is provided on the oil circuit of the fourth oil pipe, and a throttling stop valve Z2 is provided on the oil circuit of the fifth oil pipe; the second oil pipe is connected to the 2 ports of the shuttle valve through the throttling stop valve Z4; the third oil pipe is connected to the 2 ports of the fourth balancing valve through the throttling stop valve Z3; the fourth oil pipe is connected to the 2 ports of the second balancing valve through the throttling stop valve Z1; the fifth oil pipe is connected to the 2 ports of the third balancing valve through the throttling stop valve Z2.

[0015] In the emergency descent control system of a high-altitude aerial work vehicle as described above, it is preferred that, during emergency operation, the stop valve Z between the C1 port and the C2 port of the rotary buffer valve is in an open state, and the C1 port and the C2 port of the rotary buffer valve are connected; during non-emergency operation, the stop valve Z between the C1 port and the C2 port of the rotary buffer valve is in a closed state, and the C1 port and the C2 port of the rotary buffer valve are not connected.

[0016] The emergency descent control system for a high-altitude aerial work vehicle as described above, wherein preferably, when the high-altitude aerial work vehicle is working normally, the throttle stop valve Z1, the throttle stop valve Z2, the throttle stop valve Z3, the throttle stop valve Z4, the two-position two-way manual reversing valve and the stop valve Z of the rotary buffer valve connected to the oil outlet P of the manual pump are in a closed state.

[0017] As described above, in the emergency descent control system for a high-altitude aerial work vehicle, preferably, when the main power source of the high-altitude aerial work vehicle fails and emergency operation is required, the telescopic states of the two-arm telescopic cylinder, the two-arm luffing cylinder and the one-arm telescopic cylinder are: first retract the two-arm telescopic cylinder, then retract the one-arm telescopic cylinder, and finally drop the two-arm luffing cylinder.

[0018] As described above, the emergency descent control system of the high-altitude aerial work vehicle, wherein, preferably, in the process of retracting the two-arm telescopic cylinder, the throttle stop valve Z2, the throttle stop valve Z3, the throttle stop valve Z4 and the two-position two-way manual reversing valve are in a closed state, and the throttle stop valve Z1 is in an open state, so that in the process of operating the manual pump, when the displayed pressure of the pressure gauge is greater than the opening pressure of the balancing valve P2 in the second balancing valve, the hydraulic oil output by the manual pump enters the 2nd port of the second balancing valve from the fourth oil pipe, enters the 3rd port of the corresponding shuttle valve S from the 2nd port, enters the K2 port from the 3rd port, opens the balancing valve P2, and the C2 port It is connected with the V2 port, and the rodless chamber of the two-arm telescopic cylinder is connected with the C2 port, so that in the process of operating the corresponding reversing valve of the proportional reversing valve group, the hydraulic oil in the rodless chamber of the two-arm telescopic cylinder enters the B2 port of the proportional reversing valve group through the C2 port and V2 port of the second balancing valve, flows back to the R port from the B2 port, and flows back to the oil tank through the return oil pipe, so as to realize the retraction action of the two-arm telescopic cylinder; after the two-arm telescopic cylinder is retracted into place, the two-position two-way manual reversing valve is in an open state, so that when the fourth oil pipe is depressurized to the pressure gauge displaying 0, the balancing valve P2 in the second balancing valve is in a closed state, locking the rodless chamber of the two-arm telescopic cylinder, and the throttling stop valve Z1 is in a closed state.

[0019] As described above, in the emergency descent control system of the high-altitude aerial work vehicle, preferably, in the process of retracting the one-arm telescopic cylinder, the throttle stop valve Z1, the throttle stop valve Z2, and the throttle stop valve Z4 are in a closed state, the throttle stop valve Z3 is in an open state, and the two-position two-way manual reversing valve is in a closed state, so that in the process of operating the manual pump, when the displayed pressure of the pressure gauge is greater than the opening pressure of the balancing valve P2 in the fourth balancing valve, the hydraulic oil enters the 2nd port of the fourth balancing valve from the third oil pipe, enters the 3rd port of the corresponding shuttle valve S from the 2nd port, enters the K2 port from the 3rd port, opens the balancing valve P2, and the C2 port is connected to the V2 port. The rodless chamber of the one-arm telescopic cylinder is communicated with the C2 port, so that in the process of operating the corresponding reversing valve of the proportional reversing valve group, the hydraulic oil in the rodless chamber of the one-arm telescopic cylinder enters the B4 port of the proportional reversing valve group through the C2 port and the V2 port of the fourth balancing valve, flows back to the R port from the B4 port, and flows back to the oil tank through the return oil pipe to realize the retraction action of the one-arm telescopic cylinder; after the one-arm telescopic cylinder is retracted into place, the two-position two-way manual reversing valve is in an open state to relieve the pressure of the third oil pipe, and when the pressure of the third oil pipe is relieved to 0 displayed on the pressure gauge, the balancing valve P2 in the fourth balancing valve is in a closed state, locking the rodless chamber of the one-arm telescopic cylinder, and the throttling stop valve Z3 is in a closed state.

[0020] As described above, the emergency descent control system for a high-altitude aerial work vehicle, wherein, preferably, in the process of retracting the two-arm luffing cylinder, the throttle stop valve Z1, the throttle stop valve Z3 and the throttle stop valve Z4 are in a closed state, the throttle stop valve Z2 is in an open state, and the two-position two-way manual reversing valve is in a closed state, so that in the process of operating the manual pump, when the displayed pressure of the pressure gauge is greater than the opening pressure of the balancing valve P2 in the third balancing valve, the hydraulic oil enters the 2nd port of the third balancing valve from the fifth oil pipe, enters the 3rd port of the corresponding shuttle valve S from the 2nd port, enters the K2 port from the 3rd port, opens the balancing valve P2, and the C2 port is connected to the V The two ports are connected, and the rodless chamber of the two-arm luffing cylinder is connected to the C2 port, so that in the process of operating the corresponding reversing valve of the proportional reversing valve group, the hydraulic oil in the rodless chamber of the two-arm luffing cylinder enters the B3 port of the proportional reversing valve group through the C2 port and the V2 port of the third balancing valve, flows back to the R port from the B3 port, and flows back to the oil tank through the return oil pipe, so as to realize the retraction action of the two-arm luffing cylinder. After the two-arm luffing cylinder is retracted to the preset position, the two-position two-way manual reversing valve is in an open state, so that the fifth oil pipe is depressurized to when the pressure gauge displays 0, the balancing valve in the third balancing valve is in a closed state, locking the rodless chamber of the two-arm luffing cylinder, and the throttling stop valve Z2 is in a closed state.

[0021] The emergency descent control system for a high-altitude aerial work vehicle as described above, wherein preferably, when the two-arm telescopic cylinder, the one-arm telescopic cylinder or the two-arm luffing cylinder interferes with an obstacle during the retraction process, the turntable is in a rotating state to avoid the obstacle, the throttle stop valve Z1, the throttle stop valve Z2 and the throttle stop valve Z3 are in a closed state, the throttle stop valve Z4 is in an open state, and the two-position two-way manual reversing valve is in a closed state, so that during the operation of the manual pump, when the pressure displayed on the pressure gauge is greater than the opening pressure of the rotary brake , the hydraulic oil enters the port 2 of the shuttle valve from the second oil pipe, enters the port 3 of the shuttle valve from the port 2, and enters the port K of the slewing brake through the sixth oil pipe from the port 3, thereby opening the slewing brake; the stop valve Z of the slewing buffer valve is in an open state, pushing the turntable to realize the slewing action of the turntable; after the turntable is rotated to the preset position, the stop valve Z of the slewing buffer valve is in a closed state, and the two-position two-way manual reversing valve is in an open state, so that the second oil pipe is depressurized to when the pressure gauge displays 0, the slewing brake is in a closed state to lock the slewing motor.

[0022] The present invention provides an emergency descending control system for a large-height aerial work vehicle. The hydraulic oil output by a manual pump enters the control oil circuit of a balance valve and the control oil circuit of a brake. Since the control oil circuit is only for pressure transmission and does not require a large flow rate, it is easy to build up pressure. The pressure of the control oil circuit can be increased by the hydraulic oil output by the manual pump, and the corresponding balance valve is opened. The rodless chamber of the oil cylinder automatically retracts due to the pressure, and the retraction speed can be achieved by adjusting the openings of a throttle stop valve Z1, a throttle stop valve Z2, a throttle stop valve Z3 and a throttle stop valve Z4, so that a person can be dropped smoothly. The operation is convenient and labor-saving, and the descending efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0024] Figure 1 A hydraulic control principle diagram of an embodiment of an emergency descent control system for a high-altitude aerial work vehicle provided by the present invention;

[0025] Figure 2 A schematic diagram of an emergency drop control system for a high-altitude aerial work vehicle according to an embodiment of the present invention;

[0026] Figure 3 It is a structural schematic diagram of a high-altitude aerial work vehicle.

[0027] Explanation of the reference numerals: 1-oil tank, 2-oil pump, 3-first oil pipe, 4-overflow valve, 5-oil return pipe, 6-proportional reversing valve group, 7-second oil pipe, 8-third oil pipe, 9-manual pump, 10-pressure gauge, 11-two-position two-way manual reversing valve, 12-fourth oil pipe, 13-fifth oil pipe, 14-first balancing valve, 15-crank arm oil cylinder, 16-second balancing valve, 17-two-arm telescopic cylinder, 18-third balancing valve, 19-two-arm amplitude adjustment cylinder, 20-fourth balancing valve, 21-one-arm telescopic cylinder, 22-fifth balancing valve, 23-sixth balancing valve, 24-one-arm amplitude adjustment cylinder, 25-shuttle valve, 26-sixth oil pipe, 27-slewing buffer valve, 28-slewing motor, 29-slewing brake, 101-turntable, 102-one arm, 103-crank arm, 104-working bucket, 105-two arms. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0029] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprises" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be an intermediate component between the specific component and the first component or the second component. When a specific component is described as being connected to other components, the specific component may be directly connected to the other components without an intermediate component, or may not be directly connected to the other components but have an intermediate component.

[0031] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0033] like Figure 3As shown, the working part of the high-altitude aerial work vehicle is composed of an arm 102, a second arm 105, a curved arm 103, a working bucket 104 and a turntable 101; wherein, one end of the arm 102 is connected to the turntable 101, the other end of the arm 102 is connected to one end of the second arm 105, the other end of the second arm 105 is connected to the curved arm 103, and the curved arm 103 is connected to the working bucket 104 through a bracket; wherein the arm 102 is made of multiple arms, and the multiple arms are synchronously extended and retracted through a cylinder and a wire rope or a chain; the second arm 105 is also made of multiple arms, and the multiple arms are synchronously extended and retracted through a cylinder and a wire rope or a chain. The multiple arms corresponding to the arm 102 and the second arm 105 are synchronously extended and retracted through a cylinder and a wire rope or a chain.

[0034] like Figure 1 As shown, the emergency falling control system of the high-altitude aerial work vehicle provided in this embodiment includes: a manual pump 9, a pressure gauge 10 and a two-position two-way manual reversing valve 11 arranged on the side of the turntable 101, the manual pump 9 is connected to the second oil pipe 7, the third oil pipe 8, the fourth oil pipe 12 and the fifth oil pipe 13, the second balance valve 16 connected to the two-arm telescopic cylinder 17, the third balance valve 18 connected to the two-arm variable amplitude cylinder 19, and the fourth balance valve 20 connected to the one-arm telescopic cylinder 21. A slewing brake 29 is arranged in the turntable 101, and the slewing brake 29 is connected to the shuttle valve 25 through the sixth oil pipe 26. The slewing brake 29 is connected to the slewing motor 28, and a slewing buffer valve 27 is arranged between the slewing motor 28 and the shuttle valve 25, wherein:

[0035] The second balancing valve 16, the third balancing valve 18 and the fourth balancing valve 20 are all equipped with shuttle valves S, and each shuttle valve S is connected to the oil outlet of the manual pump 9 respectively;

[0036] A shuttle valve S is disposed in the rotary buffer valve 27, and the shuttle valve S is connected to the rotary buffer valve 27, the second oil pipe 7 and the rotary motor 28 respectively; a stop valve Z is disposed in the rotary buffer valve 27;

[0037] The oil suction port X of the manual pump 9 is connected to the oil tank 1 or the integrated oil return oil circuit; the oil outlet P of the manual pump 9 is respectively connected to the oil circuits of the second oil pipe 7, the third oil pipe 8, the fourth oil pipe 12 and the fifth oil pipe 13, the pressure gauge 10, and the 2 ports of the two-position two-way manual reversing valve 11;

[0038] A throttling stop valve is provided on each of the oil lines of the second oil pipe 7, the third oil pipe 8, the fourth oil pipe 12 and the fifth oil pipe 13;

[0039] Port 1 of the two-position two-way manual reversing valve 11 is connected to the oil tank 1 or the integrated oil return oil circuit.

[0040] Specifically, the port 1 of each shuttle valve S corresponding to the second balancing valve 16, the third balancing valve 18 and the fourth balancing valve 20 is respectively communicated with the port V1 of the second balancing valve 16, the third balancing valve 18 and the fourth balancing valve 20, the port 3 of each shuttle valve S is respectively communicated with the control port K2 of the second balancing valve 16, the third balancing valve 18 and the fourth balancing valve 20, and the port 2 of each shuttle valve S is respectively communicated with the oil outlet of the manual pump 9;

[0041] The shuttle valve S corresponding to the rotary buffer valve 27 is arranged between the V1 port and the V2 port of the rotary buffer valve 27, the 1 port of the shuttle valve S is communicated with the V2 port of the rotary buffer valve 27, the 2 port of the shuttle valve S is communicated with the V1 port of the rotary buffer valve 27, the 3 port of the shuttle valve S is connected with the 1 port of the shuttle valve 25, the 2 port of the shuttle valve 25 is connected with the second oil pipe 7, and the 3 port of the shuttle valve 25 is connected with the brake port K of the rotary motor 28; the stop valve Z of the rotary buffer valve 27 is arranged between the C1 port and the C2 port of the rotary buffer valve 27;

[0042] A throttle stop valve Z4 is provided on the oil circuit of the second oil pipe 7, a throttle stop valve Z3 is provided on the oil circuit of the third oil pipe 8, a throttle stop valve Z1 is provided on the oil circuit of the fourth oil pipe 12, and a throttle stop valve Z2 is provided on the oil circuit of the fifth oil pipe 13; the second oil pipe 7 is connected to the two ports of the shuttle valve 25 through the throttle stop valve Z4; the third oil pipe 8 is connected to the two ports of the fourth balancing valve 20 through the throttle stop valve Z3; the fourth oil pipe 12 is connected to the two ports of the second balancing valve 16 through the throttle stop valve Z1; the fifth oil pipe 13 is connected to the two ports of the third balancing valve 18 through the throttle stop valve Z2.

[0043] A shuttle valve S is installed in each of the second balancing valve 16, the third balancing valve 18 and the fourth balancing valve 20, and a port 1 of each of the shuttle valves S is communicated with a port V1 of the second balancing valve 16, the third balancing valve 18 and the fourth balancing valve 20, respectively; a port 3 of each of the shuttle valves S is communicated with a control port K2 of the second balancing valve 16, the third balancing valve 18 and the fourth balancing valve 20, respectively; and a port 2 of each of the shuttle valves S is communicated with an oil outlet of the manual pump 9, respectively;

[0044] Among them, during emergency operation, the stop valve Z between the C1 port and the C2 port of the rotary buffer valve 27 is in an open state, and the C1 port and the C2 port of the rotary buffer valve 27 are connected; during non-emergency operation, the stop valve Z between the C1 port and the C2 port of the rotary buffer valve 27 is in a closed state, and the C1 port and the C2 port of the rotary buffer valve 27 are not connected.

[0045] Among them, when the high-altitude aerial work vehicle is working normally, the throttle stop valve Z1, the throttle stop valve Z2, the throttle stop valve Z3, the throttle stop valve Z4, the two-position two-way manual reversing valve 11 and the stop valve Z of the rotary buffer valve 27 connected to the oil outlet P of the manual pump 9 are in a closed state. At this time, the oil pump 2 sucks oil from the oil tank 1, and the overflow valve 4 is connected in parallel to the outlet of the oil pump 2 to limit the maximum pressure of the outlet of the oil pump 2. The hydraulic oil discharged by the oil pump 2 enters the proportional reversing valve group 6 through the first oil pipe 3, and each proportional reversing valve in the proportional reversing valve group 6 controls the movement direction of each oil cylinder and motor respectively.

[0046] For example, when the turntable 101 rotates, oil flows out of the A6 port or the B6 port of the proportional reversing valve group 6 and enters the V2 port or the V1 port of the rotary buffer valve 27. When oil flows into the V1 port of the rotary buffer valve 27, the oil flows from the V1 port through the 2 port of the shuttle valve S and enters the 3 port of the shuttle valve S. From the 3 port of the shuttle valve S, the oil flows into the 1 port of the shuttle valve 25. From the 1 port of the shuttle valve 25, the oil flows into the 3 port of the shuttle valve 25. From the 3 port of the shuttle valve 25, the oil flows into the K port of the rotary brake 29 through the sixth oil pipe 26, thereby opening the rotary brake. 29; one way from port V1 through the rotary buffer valve 27 to enter the rotary motor 28 from port C2; one way from port V1 to port P1, open the balance valve P1 of port C2, the hydraulic oil flows from the rotary motor 28 to port C2, from port C2 to port V2 through the balance valve P1, from port V2 to port B6 of the proportional reversing valve group 6, from port B6 to port R of the proportional reversing valve group 6 through the reversing valve, from port R to port R through the return oil pipe 5 to return to the oil tank 1, to achieve the rotary action of the turntable 101;

[0047] When the arm 102 retracts, oil flows out from the A4 port of the proportional reversing valve group 6, enters the V1 port of the fourth balancing valve 20 from the A4 port, passes through the one-way valve of the balancing valve P1 from the V1 port to the C1 port, and enters the rod chamber of the arm telescopic cylinder 21 from the C1 port; passes through the 1 port of the shuttle valve S from the V1 port to the 3 port of the shuttle valve S, and enters the K2 port of the fourth balancing valve 20 from the 3 port of the shuttle valve S. The balancing valve P2 is opened, and the hydraulic oil flows from the rodless chamber of the arm telescopic cylinder 21 to the C2 port, enters the V2 port through the balancing valve P2 from the C2 port, enters the B4 port of the proportional reversing valve group 6 from the V2 port, flows into the R port of the proportional reversing valve group 6 through the reversing valve from the B4 port, and flows back to the oil tank 1 from the R port through the return oil pipe 5, thereby realizing the retraction action of the arm 102.

[0048] The other actions are similar during normal operation and will not be described in detail here.

[0049] Furthermore, in the event of a failure in the main power source of a high-altitude aerial work vehicle and emergency operation is required, Figure 2As shown, from position 1 to position 3 through position 2, the telescopic states of the two-arm telescopic cylinder 17, the two-arm variable amplitude cylinder 19 and the one-arm telescopic cylinder 21 are: first retract the two-arm telescopic cylinder 17, then retract the one-arm telescopic cylinder 21, and finally drop the two-arm variable amplitude cylinder 19. Since the vehicle is large and the oil cylinder area is large, if the hydraulic oil discharged by the emergency pump drives the oil cylinder to move, it requires a large power and consumes a large amount of energy. In the present invention, the hydraulic oil output by the manual pump 9 enters the control oil circuit of the balance valve and the control oil circuit of the brake. Since the control oil circuit is only pressure transmission and does not require a large flow, it is easy to build pressure. Therefore, the control oil circuit pressure can be increased by the hydraulic oil output by the manual pump 9, and the corresponding balance valve is opened. The rodless chamber of the oil cylinder automatically retracts due to pressure. The retraction speed can be achieved by adjusting the openings of the throttle stop valve Z1, the throttle stop valve Z2, the throttle stop valve Z3 and the throttle stop valve Z4, so that the person can be landed smoothly.

[0050] Specifically, in the process of retracting the two-arm telescopic cylinder 17, the throttle stop valve Z2, the throttle stop valve Z3, the throttle stop valve Z4 and the two-position two-way manual reversing valve 11 are in a closed state, and the throttle stop valve Z1 is in an open state, so that in the process of operating the manual pump 9, when the displayed pressure of the pressure gauge 10 is greater than the opening pressure of the balancing valve P2 in the second balancing valve 16, the hydraulic oil output by the manual pump 9 enters the fourth oil pipe 12 from the fourth oil pipe 12. Port 2 of the second balancing valve 16 enters port 3 of the corresponding shuttle valve S from port 2, and enters port K2 from port 3, opening the balancing valve P2, and ports C2 and V2 are connected, and the rodless chamber of the two-arm telescopic cylinder 17 is connected to port C2. At this time, the corresponding reversing valve of the proportional reversing valve group 6 is operated to make the hydraulic oil of the rodless chamber of the two-arm telescopic cylinder 17 enter port B2 of the proportional reversing valve group 6 through ports C2 and V2 of the second balancing valve 16, and flow back to port R from port B2, and flow back to the oil tank 1 through the return oil pipe 5, so as to realize the retraction action of the two-arm telescopic cylinder 17. The speed of the retraction action can be realized by adjusting the opening size of the throttling stop valve Z1. After the two-arm telescopic cylinder 17 retracts into position, the two-position two-way manual reversing valve 11 is in an open state, so that the fourth oil pipe 12 is depressurized until the pressure gauge 10 displays 0, and the balancing valve P2 in the second balancing valve 16 is in a closed state, locking the rodless chamber of the two-arm telescopic cylinder 17, and the throttling stop valve Z1 is in a closed state.

[0051] In the process of retracting the one-arm telescopic cylinder 21, the throttle stop valve Z1, the throttle stop valve Z2, and the throttle stop valve Z4 are in a closed state, the throttle stop valve Z3 is in an open state, and the two-position two-way manual reversing valve 11 is in a closed state, so that in the process of operating the manual pump 9, when the displayed pressure of the pressure gauge 10 is greater than the opening pressure of the balancing valve P2 in the fourth balancing valve 20, the hydraulic oil enters the fourth balancing valve 20 from the third oil pipe 8. 2 port, enters the 3 port of the corresponding shuttle valve S from the 2 port, enters the K2 port from the 3 port, opens the balancing valve P2, the C2 port is communicated with the V2 port, and the rodless chamber of the one-arm telescopic cylinder 21 is communicated with the C2 port. At this time, the corresponding reversing valve of the proportional reversing valve group 6 is operated to make the hydraulic oil of the rodless chamber of the one-arm telescopic cylinder 21 enter the B4 port of the proportional reversing valve group 6 through the C2 port and the V2 port of the fourth balancing valve 20, flow back to the R port from the B4 port, and flow back to the oil tank 1 through the return oil pipe 5, so as to realize the retraction action of the one-arm telescopic cylinder 21; after the one-arm telescopic cylinder 21 is retracted into place, the two-position two-way manual reversing valve 11 is in an open state to relieve the pressure of the third oil pipe 8, and when the pressure of the third oil pipe 8 is relieved to 0 displayed on the pressure gauge 10, the balancing valve P2 in the fourth balancing valve 20 is in a closed state, locking the rodless chamber of the one-arm telescopic cylinder 21, and the throttling stop valve Z3 is in a closed state.

[0052] In the process of retracting the two-arm luffing cylinder 19, the throttle stop valve Z1, the throttle stop valve Z3 and the throttle stop valve Z4 are in a closed state, the throttle stop valve Z2 is in an open state, and the two-position two-way manual reversing valve 11 is in a closed state, so that in the process of operating the manual pump 9, when the displayed pressure of the pressure gauge 10 is greater than the opening pressure of the balance valve P2 in the third balance valve 18, the hydraulic oil enters the third balance valve 18 from the fifth oil pipe 13. 8, enters port 3 of the corresponding shuttle valve S from port 2, enters port K2 from port 3, opens the balancing valve P2, and the C2 port is communicated with the V2 port. The rodless chamber of the two-arm luffing cylinder 19 is communicated with the C2 port. At this time, the corresponding reversing valve of the proportional reversing valve group 6 is operated to make the hydraulic oil in the rodless chamber of the two-arm luffing cylinder 19 enter the B3 port of the proportional reversing valve group 6 through the C2 port and the V2 port of the third balancing valve 18, flow back to the R port from the B3 port, and flow back to the oil tank 1 through the return oil pipe 5, so as to realize the retraction action of the two-arm luffing cylinder 19. After the two-arm luffing cylinder 19 is retracted to the preset position, the two-position two-way manual reversing valve 11 is in the open state, so that the fifth oil pipe 13 is depressurized to when the pressure gauge 10 displays 0, the balancing valve P2 in the third balancing valve 18 is in the closed state, the rodless chamber of the two-arm luffing cylinder 19 is locked, and the throttling stop valve Z2 is in the closed state.

[0053] Furthermore, when the two-arm telescopic cylinder 17, the one-arm telescopic cylinder 21 or the two-arm variable-length cylinder 19 interferes with an obstacle during the retraction process, the turntable 101 is in a rotating state to avoid the obstacle. Specifically, the throttle stop valve Z1, the throttle stop valve Z2 and the throttle stop valve Z3 are in a closed state, the throttle stop valve Z4 is in an open state, and the two-position two-way manual reversing valve 11 is in a closed state, so that during the operation of the manual pump 9, when the pressure displayed by the pressure gauge 10 is greater than the opening pressure of the rotary brake 29, the hydraulic oil enters the 2nd port of the shuttle valve 25 from the second oil pipe 7, enters the 3rd port of the shuttle valve 25 from the 2nd port, and enters the 3rd port through the sixth oil pipe 26. Into the K port of the rotary brake 29, thereby opening the rotary brake 29; at this time, open the stop valve Z of the rotary buffer valve 27, push the turntable 101, and the turntable rotation action can be realized; after the turntable 101 is rotated to the preset position, the stop valve Z of the rotary buffer valve 27 is in a closed state, and the two-position two-way manual reversing valve 11 is in an open state, so that the second oil pipe 7 is depressurized to when the pressure gauge 10 displays 0, the rotary brake 29 is in a closed state to lock the rotary motor 28.

[0054] By retracting the two-arm telescopic cylinder 17, the one-arm telescopic cylinder 21, the two-arm variable-length cylinder 19 and the emergency operation of the rotary turntable 101, a smaller flow rate can be used to build up pressure, and the second balance valve 16, the third balance valve 18, the fourth balance valve 20 and the rotary brake 29 can be opened step by step, saving manpower and energy, so that people can be lowered to a safe position more easily. During the operation, in order to ensure a smooth descent, the size of the throttling hole of the corresponding throttling stop valve Z1, throttling stop valve Z2, throttling stop valve Z3, and throttling stop valve Z4 can be adjusted to achieve this.

[0055] The present invention provides a manual pump in the hydraulic control system, and the hydraulic oil output by the manual pump is connected to the control oil circuit of each execution action; each control oil circuit is provided with a throttling stop valve and a shuttle valve; a pressure gauge and a switch valve are provided at the oil outlet of the manual pump, the pressure gauge is used to set the pressure of each control oil circuit, and the switch valve is used to build up pressure and release the pressure of the control system. When a certain oil circuit is selected to work, the switch valve is closed first, and then the throttling stop valves of other oil circuits are closed, and the manual pump is operated. When the pressure reaches the required pressure, the manual pump is stopped, and the electronically controlled reversing valve of the corresponding action is operated, so that the corresponding oil cylinder can automatically fall by gravity. After the falling is completed, the switch valve is opened to release the control system pressure. After the release is completed, the switch valve is closed, thereby effectively solving the problems existing in the prior art.

[0056] The emergency descent control system for a high-altitude aerial work vehicle provided in an embodiment of the present invention uses hydraulic oil output by a manual pump to enter the control oil circuit of a balancing valve and the control oil circuit of a brake. Since the control oil circuit only transmits pressure and does not require a large flow rate, it is easy to build up pressure. The pressure of the control oil circuit can be increased by the hydraulic oil output by the manual pump, and the corresponding balancing valve can be opened. The rodless chamber of the oil cylinder automatically retracts due to the pressure, and the retraction speed can be achieved by adjusting the openings of the throttle stop valve Z1, the throttle stop valve Z2, the throttle stop valve Z3 and the throttle stop valve Z4, so that the person can be dropped smoothly. The operation is convenient and labor-saving, and the descent efficiency is high.

[0057] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0058] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. An emergency drop control system for a high altitude aerial work vehicle, characterized in that: include: A manual pump, a pressure gauge and a two-position two-way manual reversing valve are arranged on the side of the turntable. The manual pump is connected to the second oil pipe, the third oil pipe, the fourth oil pipe and the fifth oil pipe, the second balancing valve connected to the two-arm telescopic cylinder, the third balancing valve connected to the two-arm variable amplitude cylinder, and the fourth balancing valve connected to the one-arm telescopic cylinder. A slewing brake is arranged in the turntable. The slewing brake is connected to a shuttle valve through a sixth oil pipe. The slewing brake is connected to a slewing motor. A slewing buffer valve is arranged between the slewing motor and the shuttle valve, wherein: A shuttle valve S is installed in each of the second balancing valve, the third balancing valve and the fourth balancing valve, and each of the shuttle valves S is communicated with the oil outlet of the manual pump respectively; A shuttle valve S is arranged in the rotary buffer valve, and the shuttle valve S is respectively connected to the rotary buffer valve, the second oil pipe and the rotary motor; a stop valve Z is arranged in the rotary buffer valve; The oil suction port X of the manual pump is connected to the oil tank or the integrated oil return oil circuit; the oil outlet P of the manual pump is respectively connected to the oil circuits of the second oil pipe, the third oil pipe, the fourth oil pipe and the fifth oil pipe, the pressure gauge, and the 2 ports of the two-position two-way manual reversing valve; A throttling stop valve is provided on each of the oil lines of the second oil pipe, the third oil pipe, the fourth oil pipe and the fifth oil pipe; Port 1 of the two-position two-way manual reversing valve is connected to an oil tank or an integrated oil return oil circuit.

2. The emergency drop control system for a high altitude aerial work vehicle according to claim 1, characterized in that: Port 1 of each shuttle valve S corresponding to the second balancing valve, the third balancing valve and the fourth balancing valve is communicated with port V1 of the second balancing valve, the third balancing valve and the fourth balancing valve respectively, port 3 of each shuttle valve S is communicated with control port K2 of the second balancing valve, the third balancing valve and the fourth balancing valve respectively, and port 2 of each shuttle valve S is communicated with the oil outlet of the manual pump respectively; The shuttle valve S corresponding to the rotary buffer valve is arranged between the V1 port and the V2 port of the rotary buffer valve, the 1 port of the shuttle valve S is communicated with the V2 port of the rotary buffer valve, the 2 port of the shuttle valve S is communicated with the V1 port of the rotary buffer valve, the 3 port of the shuttle valve S is connected with the 1 port of the shuttle valve, the 2 port of the shuttle valve is connected with the second oil pipe, and the 3 port of the shuttle valve is connected with the brake port K of the rotary motor; the stop valve Z of the rotary buffer valve is arranged between the C1 port and the C2 port of the rotary buffer valve; A throttling stop valve Z4 is provided on the oil circuit of the second oil pipe, a throttling stop valve Z3 is provided on the oil circuit of the third oil pipe, a throttling stop valve Z1 is provided on the oil circuit of the fourth oil pipe, and a throttling stop valve Z2 is provided on the oil circuit of the fifth oil pipe; the second oil pipe is connected to the 2 ports of the shuttle valve through the throttling stop valve Z4; the third oil pipe is connected to the 2 ports of the fourth balancing valve through the throttling stop valve Z3; the fourth oil pipe is connected to the 2 ports of the second balancing valve through the throttling stop valve Z1; the fifth oil pipe is connected to the 2 ports of the third balancing valve through the throttling stop valve Z2.

3. The emergency drop control system for a high altitude aerial work vehicle according to claim 2, characterized in that: During emergency operation, the stop valve Z between the C1 port and the C2 port of the rotary buffer valve is in an open state, and the C1 port and the C2 port of the rotary buffer valve are connected; during non-emergency operation, the stop valve Z between the C1 port and the C2 port of the rotary buffer valve is in a closed state, and the C1 port and the C2 port of the rotary buffer valve are not connected.

4. The emergency drop control system for a high altitude aerial work vehicle according to claim 2, characterized in that: When the high-altitude aerial work vehicle is working normally, the throttle stop valve Z1, the throttle stop valve Z2, the throttle stop valve Z3, the throttle stop valve Z4, the two-position two-way manual reversing valve and the stop valve Z of the rotary buffer valve connected to the oil outlet P of the manual pump are in a closed state.

5. The emergency drop control system for a high altitude aerial work vehicle according to claim 2, characterized in that: When the main power source of the high-altitude aerial work vehicle fails and emergency operation is required, the telescopic states of the two-arm telescopic cylinder, the two-arm luffing cylinder and the one-arm telescopic cylinder are: first retract the two-arm telescopic cylinder, then retract the one-arm telescopic cylinder, and finally drop the two-arm luffing cylinder.

6. The emergency drop control system for a high altitude aerial work vehicle according to claim 5, characterized in that: In the process of retracting the two-arm telescopic cylinder, the throttle stop valve Z2, the throttle stop valve Z3, the throttle stop valve Z4 and the two-position two-way manual reversing valve are in a closed state, and the throttle stop valve Z1 is in an open state. In the process of operating the manual pump, when the displayed pressure of the pressure gauge is greater than the opening pressure of the balancing valve P2 in the second balancing valve, the hydraulic oil output by the manual pump enters the 2nd port of the second balancing valve from the fourth oil pipe, enters the 3rd port of the corresponding shuttle valve S from the 2nd port, and enters the K2 port from the 3rd port, opens the balancing valve P2, and the C2 port is connected to the V2 port. The rod chamber is communicated with the C2 port, so that in the process of operating the corresponding reversing valve of the proportional reversing valve group, the hydraulic oil in the rodless chamber of the two-arm telescopic cylinder enters the B2 port of the proportional reversing valve group through the C2 port and the V2 port of the second balancing valve, flows back to the R port from the B2 port, and flows back to the oil tank through the return oil pipe, thereby realizing the retraction action of the two-arm telescopic cylinder; after the two-arm telescopic cylinder is retracted into place, the two-position two-way manual reversing valve is in an open state, so that the fourth oil pipe is depressurized until the pressure gauge displays 0, and the balancing valve P2 in the second balancing valve is in a closed state, locking the rodless chamber of the two-arm telescopic cylinder, and the throttling stop valve Z1 is in a closed state.

7. The emergency drop control system for a high-altitude aerial work vehicle according to claim 5, characterized in that: In the process of retracting the one-arm telescopic cylinder, the throttle stop valve Z1, the throttle stop valve Z2, and the throttle stop valve Z4 are in a closed state, the throttle stop valve Z3 is in an open state, and the two-position two-way manual reversing valve is in a closed state, so that in the process of operating the manual pump, when the displayed pressure of the pressure gauge is greater than the opening pressure of the balancing valve P2 in the fourth balancing valve, the hydraulic oil enters the 2nd port of the fourth balancing valve from the third oil pipe, enters the 3rd port of the corresponding shuttle valve S from the 2nd port, and enters the K2 port from the 3rd port, opens the balancing valve P2, and the C2 port is connected to the V2 port, and the rodless chamber of the one-arm telescopic cylinder is connected to the C2 port. , so that in the process of operating the corresponding reversing valve of the proportional reversing valve group, the hydraulic oil in the rodless chamber of the one-arm telescopic cylinder enters the B4 port of the proportional reversing valve group through the C2 port and V2 port of the fourth balancing valve, flows back to the R port from the B4 port, and flows back to the oil tank through the return oil pipe to realize the retraction action of the one-arm telescopic cylinder; after the one-arm telescopic cylinder is retracted into place, the two-position two-way manual reversing valve is in an open state to relieve the pressure of the third oil pipe, and when the pressure of the third oil pipe is relieved to 0 displayed on the pressure gauge, the balancing valve P2 in the fourth balancing valve is in a closed state, locking the rodless chamber of the one-arm telescopic cylinder, and the throttling stop valve Z3 is in a closed state.

8. The emergency drop control system for a high altitude aerial work vehicle according to claim 5, characterized in that: In the process of retracting the two-arm luffing cylinder, the throttle stop valve Z1, the throttle stop valve Z3 and the throttle stop valve Z4 are in a closed state, the throttle stop valve Z2 is in an open state, and the two-position two-way manual reversing valve is in a closed state. In the process of operating the manual pump, when the displayed pressure of the pressure gauge is greater than the opening pressure of the balancing valve P2 in the third balancing valve, the hydraulic oil enters the 2nd port of the third balancing valve from the fifth oil pipe, enters the 3rd port of the corresponding shuttle valve S from the 2nd port, and enters the K2 port from the 3rd port, opens the balancing valve P2, and the C2 port is connected to the V2 port, and the rodless chamber of the two-arm luffing cylinder is opened. It is connected to the C2 port so that in the process of operating the corresponding reversing valve of the proportional reversing valve group, the hydraulic oil in the rodless chamber of the two-arm luffing cylinder enters the B3 port of the proportional reversing valve group through the C2 port and V2 port of the third balancing valve, flows back to the R port from the B3 port, and flows back to the oil tank through the return oil pipe, thereby realizing the retraction action of the two-arm luffing cylinder. After the two-arm luffing cylinder is retracted to the preset position, the two-position two-way manual reversing valve is in an open state, so that the fifth oil pipe is depressurized to when the pressure gauge displays 0, the balancing valve in the third balancing valve is in a closed state, locking the rodless chamber of the two-arm luffing cylinder, and the throttling stop valve Z2 is in a closed state.

9. The emergency drop control system for a high altitude aerial work vehicle according to claim 5, characterized in that: When the two-arm telescopic cylinder, the one-arm telescopic cylinder or the two-arm luffing cylinder interferes with an obstacle during the retraction process, the turntable is in a rotating state to avoid the obstacle, the throttle stop valve Z1, the throttle stop valve Z2 and the throttle stop valve Z3 are in a closed state, the throttle stop valve Z4 is in an open state, and the two-position two-way manual reversing valve is in a closed state, so that in the process of operating the manual pump, when the pressure displayed on the pressure gauge is greater than the opening pressure of the rotary brake, the hydraulic oil enters the second oil pipe from the second oil pipe. Port 2 of the shuttle valve enters port 3 of the shuttle valve from port 2, and enters port K of the slewing brake through the sixth oil pipe from port 3, thereby opening the slewing brake; the stop valve Z of the slewing buffer valve is in an open state, and the turntable is pushed to realize the slewing action of the turntable; after the turntable is rotated to the preset position, the stop valve Z of the slewing buffer valve is in a closed state, and the two-position two-way manual reversing valve is in an open state, so that the second oil pipe is depressurized to when the pressure gauge displays 0, the slewing brake is in a closed state to lock the slewing motor.

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